// Copyright(C) 2024 InfiniFlow, Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//
//     https://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

module;

export module infinity_core:lemmatizer;

import :status;

namespace infinity {

export class Lemmatizer {
public:
    Lemmatizer(const std::string &path);

    ~Lemmatizer();

    Status Load();

    std::string Lemmatize(const std::string &form, const std::string &pos = "");

private:
    Status LoadLemmaPosOffsetMap();

    void LoadExceptionMap();

    std::vector<std::string> Morphy(const std::string &form, const std::string &pos, bool check_exceptions = true);

    std::vector<std::string> ApplyRules(const std::vector<std::string> &forms, const std::string &pos);

    std::vector<std::string> FilterForms(const std::vector<std::string> &forms, const std::string &pos);

    std::string path_;

    std::unordered_map<std::string, std::unordered_map<std::string, std::vector<int>>> lemma_pos_offset_map_;
    std::unordered_map<std::string, std::unordered_map<std::string, std::vector<std::string>>> exception_map_;
    std::unordered_map<std::string, int> pos_numbers_;
    std::unordered_map<int, std::string> pos_names_;
    std::unordered_map<std::string, std::string> file_map_;
    std::unordered_map<std::string, std::vector<std::pair<std::string, std::string>>> MORPHOLOGICAL_SUBSTITUTIONS;
    std::vector<std::string> POS_LIST;
};

} // namespace infinity